Abstract:
The invention provides a process for producing a water dispersion for ink jet recording,which comprises the following steps 1 and 2: (Step 1) a step of obtaining a pigment treated with (a) a water-insoluble vinyl polymer particles by making a pigment and (a) a water-insoluble vinyl polymer particles present in an aqueous solvent and then removing the solvent; and (Step 2) a step of obtaining a water dispersion of a pigment-containing water-insoluble vinyl polymer particles by dispersing a mixture comprising the water-insoluble vinyl polymer particle (a)-treated pigment obtained in step 1, an organic solvent, (b) a water-insoluble vinyl polymer and water and then removing the organic solvent.
Abstract:
Verfahren zur Herstellung einer Wasserdispersion zur Tintenstrahlaufzeichnung, umfassend die folgenden Schritte 1 und 2: (Schritt 1) einen Schritt zum Herstellen eines mit wasserunlöslichen Vinylpolymerteilchen (a) behandelten Pigments durch Einbringen eines Pigments und wasserunlöslicher Vinylpolymerteilchen (a) in ein wässriges Lösungsmittel und dann Entfernen des Lösungsmittels; und (Schritt 2) einen Schritt zum Herstellen einer Wasserdispersion von Pigment enthaltenden, wasserunlöslichen Vinylpolymerteilchen durch Dispergieren eines Gemisches, umfassend das mit wasserunlöslichen Vinylpolymerteilchen (a) behandelte Pigment, das im Schritt 1 erhalten wird, ein organisches Lösungsmittel, ein wasserunlösliches Vinylpolymer (b) und Wasser, und dann Entfernen des organischen Lösungsmittels.
Abstract:
The first invention relates to a water-based ink for ink-jet printing which includes colorant-containing polymer particles (A) obtained by dispersing a colorant with a water-soluble polymer (x) and a water-insoluble polymer (y), a water-soluble organic solvent (B) and water, wherein a weight ratio of the water-insoluble polymer (y) to the water-soluble polymer (x) [(y)/(x)] is from 2.0 to 5.0, and a content of the water-soluble organic solvent (B) in the ink is from 10 to 70% by weight. The water-based ink for ink-jet printing according to the first invention is excellent in ejection property and optical density and exhibits a low viscosity. The second invention relates to a process for producing a water dispersion for ink-jet printing, which includes a step (I) of mixing a dispersion of a colorant with an emulsion of a water-insoluble polymer containing an organic solvent; a step (II) of subjecting the resulting mixture to dispersing treatment to obtain a dispersion of the colorant onto which the water-insoluble polymer is deposited; and a step (III) of removing the organic solvent from the resulting dispersion. The water dispersion produced by the process of the second invention is capable of exhibiting a high optical density suitable for high-speed printing.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for smoothly starting a continuous bead mill packed with fine beads. SOLUTION: A starting method is disclosed for the continuous bead mill 10 which is provided with a stator 11 having a liquid feed port 13 at the bottom and an agitating rotor 12 provided in the stator 11, and which is packed with fine beads with an average particle size of 0.1 mm or less in 70 vol.% or more in an effective dispersion chamber space in the stator 11. In the starting method, liquid is fed into the stator 11 from the liquid feed port 13 at the bottom of the stator 11 to float the fine beads so that a stator cross area-based liquid average empty tower velocity expressed by expression (1) is 0.4×10 -3 m/s or more and a liquid pressing ratio expressed by expression (2) is 0.1 or more, and the agitating rotor 12 is rotationally driven while the fine beads are floated. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an aqueous pigment dispersion excellent in dispersibility and dispersion stability, an aqueous pigment dispersion and inkjet recording aqueous ink reducing contamination by foreign matter even when hydrophobic silica is mixed. SOLUTION: The method for producing the aqueous pigment dispersion comprises a process 1 for obtaining the dispersion A by dispersing a mixture containing a pigment, a water-insoluble polymer, a hydrophobic organic solvent and water, a process 2 for obtaining a dispersion B by mixing hydrophobic silica, a hydrophobic organic solvent, and a hydrophilic organic solvent in amount of 0.5-10 weight times of the hydrophobic silica, and a process 3 for obtaining a dispersion C by mixing the dispersion A and the dispersion B together. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a process for producing an aqueous pigment dispersion having a high color density, and is excellent in gloss and marring resistance when printed on specialized paper; and to provide an aqueous ink for inkjet recording. SOLUTION: The process for producing an aqueous pigment dispersion comprises: (1) a first step in which an emulsion composition (A) comprising a water-insoluble polymer having a specific weight-average molecular weight and a salt-forming group, an organic solvent having a specific water solubility, a neutralizing agent, and water is mixed with a pigment (B) to obtain a mixture as a predispersion having a nonvolatile content of 5-50% by weight and an organic solvent/water ratio of 0.1-0.9 by weight; (2) a second step in which the predispersion is continuously dispersed with a dispersing-medium type disperser and the resultant dispersion treated product is continuously separated from the medium particles; and (3) a third step in which the dispersion is treated with a homogenizer for further dispersing the pigment. Also provided is a water-based ink for inkjet recording containing the aqueous pigment dispersion obtained by the process. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing the objective radical addition reaction product in high yield by simple operation. SOLUTION: This method for producing a radical addition reaction product from a polymerizable monomer and an organic compound A capable of making a radical addition reaction with the polymerizable monomer, comprises the steps of (A) extracting part of an organic compound A-containing liquid put into a reaction vessel and adjusting the temperature of the thus extracted liquid to a specified value and (B) mixing the extracted liquid and the polymerizable monomer together and putting the resultant mixture into the reaction vessel.
Abstract:
PROBLEM TO BE SOLVED: To obtain the subject compound having excellent hue, etc., in high conversion and productivity with simple operability and easy removal of by- produced hydrochloric acid by sulfating an N-alkylamidoalkanol in the presence of a solvent at a low temperature and raising the temperature of the reaction system. SOLUTION: The objective N-alkylamidoalkanol sulfuric acid ester (salt) of formula II (M is H or a cation) is produced by sulfating an N- alkylamidoalkanol of formula I (R is a 6-22C straight or branched-chain alkyl, alkenyl, etc.; R is H or a 1-22C straight or branched-chain alkyl, etc.; R is a 1-5C straight or branched-chain alkylene; R is a 2-3C straight or branched- chain alkylene; (n) is an average addition molar number of alkylene oxide and is 0-50) with chlorosulfonic acid as a sulfating agent in the presence of a solvent at
Abstract:
PROBLEM TO BE SOLVED: To provide a process for efficiently producing a dispersion for inkjet recording, wherein finely grained pigment is stably dispersed.SOLUTION: [1] The process includes: a step (A) for producing an aqueous pigment dispersion containing a treated pigment by the reaction of the pigment with a treating agent that can introduce a hydrophilic group into the pigment, while a mixture that contains the pigment and an aqueous medium is ground by means of a media mill, and a step (B) for adding a polymer having an acid value of 150 to 250 mg-KOH/g to an aqueous pigment dispersion that contains the treated pigment and dispersing the resulting material by using a high pressure homogenizer. [2] An aqueous ink for inkjet recording contains the aqueous pigment dispersion produced by the process described in [1].